| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #define sigsetjmp __sigsetjmp |
| |
| .text |
| .p2align 4, 0x90 /* align on 16-byte boundary and fill with NOPs */ |
| |
| .globl os_arch_frame_init |
| .globl _os_arch_frame_init |
| /* |
| * void os_arch_frame_init(struct stack_frame *sf) |
| */ |
| |
| os_arch_frame_init: |
| /* ABI stack frame */ |
| addi $sp, $sp, -24 /* 8 bytes for register save, 16 for args */ |
| sw $ra, 0x20($sp) /* push ra to stack */ |
| sw $s0, 0x16($sp) /* push s0 to the stack */ |
| |
| /* save and update sp to sf */ |
| move $s0, $a0 /* move sf to s0 */ |
| sw $sp, 0x0($s0) /* sf->mainsp = stack pointer */ |
| /* fairly sure sf will be 8 byte alligned anyway, but no harm in and vs move */ |
| and $sp, $s0, 0xfffffff1 /* stack pointer = sf 8 byte aligned */ |
| |
| /* call setjmp */ |
| addi $a0, $s0, 0x08 /* populate the arguments for sigsetjmp */ |
| move $a1, $zero |
| jal sigsetjmp /* sigsetjmp(sf->sf_jb, 0) */ |
| nop |
| |
| /* branch if starting task */ |
| bne $v0, $zero, os_arch_frame_init_start |
| nop |
| |
| /* back to main stack and return */ |
| lw $sp, 0x0($s0) /* back to main stack */ |
| lw $ra, 0x20($sp) /* pop ra from stack */ |
| lw $s0, 0x16($sp) /* pop s0 from the stack */ |
| addi $sp, $sp, 24 |
| jr $ra /* return */ |
| nop |
| |
| os_arch_frame_init_start: |
| move $a0, $s0 /* populate arguments for task */ |
| move $a1, $v0 |
| j os_arch_task_start /* jump to task, never to return */ |
| nop |
